In one, Rarity and Rainbow Dash survived Nightmare Moon's victory over the forces of light, eventually attaining positions of prominence and comfort in the Nightmare's service. But when the unexpected visit of an Alicorn and Dragon sheds light on a growing conspiracy against the wicked mistress of the night, Rarity and Rainbow Dash may yet be inspired to risk what they have gained to join the fight for a better world.

Yet darkness lingers even in the hearts of some who would oppose the Nightmare, and not all agree on what a better world would look like...